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Finding the Fourth Proportional to 78,479.21, 116,979.51 and 72,180.65

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Solution

The fourth proportional to 78,479.21, 116,979.51 and 72,180.65 is: 107,591.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,479.21 : 116,979.51 = 72,180.65 : x
  2. Step 2: Convert to fraction form
    78,479.21/116,979.51 = 72,180.65/x
  3. Step 3: Cross multiply
    78,479.21x = 116,979.51 × 72,180.65
  4. Step 4: Simplify right side
    78,479.21x = 8,443,657,068.48
  5. Step 5: Solve for x
    x = 8,443,657,068.48/78,479.21
  6. Step 6: Final answer
    x = 107,591.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.